JP3146029B2 - Blade for cutting stalk and stem, and apparatus for cutting out straw using the blade for cutting stalk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade for cutting a stem and a stem for use in a disc-shaped planting stem and turf cutting device and the like, and to a straw cutting and shredding device using the blade for cutting a stem and a stem.

[0002]

2. Description of the Related Art As a waste straw shredding device provided at the rear of a combine, a large number of disc-shaped cutting blades for cutting stems and stems are rotated in parallel at a constant pitch to finely remove waste straw after threshing. 2. Description of the Related Art A so-called disc-type waste straw shredding device for cutting is often used, and a disc blade obtained by performing a quenching process on an outer peripheral cutting blade is used as a blade for cutting a stem.

[0003]

However, the disk blade body that has been subjected to the quenching process wears as the operating time elapses. For example, as shown in FIG. 5, the tip 4e of the blade portion 4b wears out. As a result, the cutting edge becomes round (see the dotted line in FIG. 5), and the sharpness is remarkably reduced. Therefore, re-polishing and replacement of the disk blade are required within a relatively short time.
That is, in the conventional configuration, as shown in FIG. 5, in the blade portion 4b, the hardness is the same on all of the surfaces 4c and 4d and the tip 4e, so even if the blade portion 4b itself is hardened. However, both surfaces 4c and 4d were worn away, and the tip 4e where the stem and stem were in best contact was worn out early and rounded.

[0004] The present invention provides a stem and blade cutting blade excellent in cutting performance capable of maintaining good sharpness even after long-term use, and a straw shredder using the stem and stem cutting blade. It is intended to provide.

[0005]

[Means for Solving the Problems]

[0006] The cutting body for cutting stems and stems of the invention according to claim 1 is
The blade provided on the peripheral portion of the disk-shaped main body is provided with a first surface closer to the virtual rotation surface with respect to a virtual rotation surface whose crossing angle is perpendicular to the rotation axis in a cross-sectional view, and a first surface thereof. On the back surface side of the surface, while being formed in a tapered shape by the rotation axis center and a second surface composed of an inclined surface obliquely intersecting with the first surface, an angle formed between the virtual rotation surface and the second surface is defined as:
Setting each angle of the first surface and the second surface with respect to the virtual rotation surface so that a value obtained by subtracting the angle formed by the virtual rotation surface and the first surface becomes the blade edge angle of the blade portion; The blade portion is formed by forming a thin layer of a wear-resistant compound film on one surface and positioning a second surface on the back surface side where the thin layer of the wear-resistant film does not exist. And

Further, in the blade body for cutting stems and stems according to the second aspect of the present invention, the outer periphery of the disk-shaped main body is formed in a saw-toothed blade portion.

According to a third aspect of the present invention, there is provided a cutting body for cutting stems and culms, wherein a plate surface of an outer peripheral portion of a disc-shaped main body is pressed into a radial waveform, and the waveform pressed portion is cut obliquely from one side surface. The blade portion is formed in a sawtooth shape over the entire circumference of the disk-shaped main body.

According to a fourth aspect of the present invention, there is provided a waste straw shredding device, wherein a disk-shaped main body having a blade portion formed on the outer periphery is attached to a rotating shaft which is installed substantially in parallel at predetermined intervals, and viewed in the axial direction. The stem cutting blade according to any one of claims 1, 2 and 3, wherein both blades are overlapped with each other.

[0010]

According to the above construction, a thin layer of a coating of a wear-resistant material is formed on one surface of the tapered blade provided on the periphery of the disk-shaped main body, and this surface is smaller than the inclined surface on the opposite side. It becomes a hard state. Accordingly, as the cutting operation progresses, the opposite inclined surface side wears earlier, and the thin layer side of the wear-resistant material wears later than this, and as shown by the dotted line in FIG. At the tip there is always a thin layer of wear resistant material. As a result, a sharp cutting edge is secured in the cutting portion by the cutting edge formed of a thin layer of a wear-resistant material.
Since the wear-resistant material, which is always located at the tip of the cutting blade due to the difference in wear, is a thin layer, the tip of the blade portion appears sharp according to the layer thickness. In particular, when a thin layer of a wear-resistant material is formed by welding or spraying a compound, an extremely thin thin layer of a wear-resistant material can be formed. In addition, the blade portion on which the thin layer of the wear-resistant material is located is rotated by the first surface on the side close to the virtual rotation surface perpendicular to the rotation axis of the disk-shaped main body and the back surface of the first surface. The virtual rotation surface and the first surface are tapered by an axis and a second surface formed by an inclined surface obliquely intersecting with the first surface, and from the angle formed by the virtual rotation surface and the second surface. The angles of the first surface and the second surface with respect to the virtual rotating surface are set so that the value obtained by subtracting the angle formed by the angle becomes the cutting edge angle of the blade portion. Since the thin layer is formed by the coating, the first surface on which the thin layer is formed has a tendency to come into contact with the cut stem more strongly than the second surface, and the degree of wear of the thin layer itself is further reduced. be able to.

According to the second aspect of the present invention, the diameter of the blade body is reduced with the wear of the cutting blade.
Regardless of the change in the outer shape or shape of the saw tooth, the thin layer of the wear-resistant material is located, and the sharp state is always maintained.

According to the third aspect, by cutting and polishing one side surface of the corrugated press portion obliquely, it is possible to form a sawtooth-shaped cutting blade having three-dimensional irregularities.
The cutting edge can be sharpened by a thin layer of a wear-resistant material.

According to the fourth aspect, even if a large amount of waste straw is shredded, good sharpness is maintained by the self-polishing function, and the waste straw can be efficiently cut finely.

[0014]

According to the first aspect of the present invention, one side of the blade portion is hardened by a thin layer of the wear-resistant material, so that a difference in wear is generated between the inclined surface side and the thin-layer side of the wear-resistant material. Even if abrasion progresses, a sharp layer of the abrasion-resistant material always shows a sharp tip, maintaining a sharp state,
It has become possible to exhibit good cutting performance over a long period without the need for re-polishing or replacement in a short period. In addition, the surface on which the thin layer of abrasion-resistant material is present on the blade portion is made so that the angle with respect to the virtual rotation surface around the rotation axis is hardly affected by the external force in the radial direction. Therefore, the wear of the thin layer itself can be reduced, and the durability can be further improved.

According to the second aspect of the present invention, the above-mentioned effects of the first aspect of the present invention are provided, and in particular, a cutting device, a cutting straw shredding device, and the like for cutting a stem by rotating a disk-shaped cutting blade. Can be effectively used for the stem and stem shredder.

According to the third aspect of the present invention, a disc-shaped cutting blade for cutting stems and stalks which produces the above-mentioned effects of the first or second aspect of the present invention can be manufactured at low cost.

According to the fourth aspect of the present invention, it is possible to realize a combine discharger shredding and shredding device which maintains good sharpness for a long time without requiring frequent re-polishing and has high work efficiency.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows a waste straw shredding device provided at the rear of the combine. In this waste straw shredding device, two rotating shafts 1 and 2 are laid in parallel, and a disc-shaped stem / culm cutting blade 4 having a blade portion 4b on a peripheral portion is mounted on the rotating shafts 1 and 2. It is configured to be attached at predetermined intervals via a spacer 3, and supplies waste straw coming out of a threshing device (not shown) between the rotating shafts 1 and 2, and cuts each stem / culm cutting blade 4. Blade part 4b
With this, it is cut into several centimeters and released into the field.

Next, the disc-shaped blade 4 for cutting stems and stems will be described. As shown in FIGS. 1, 2, and 3, the outer peripheral portion serving as the blade portion 4b is pressed in the flat main body 4a,
It is formed in a radial wave shape. Then, an abrasion-resistant compound is deposited or sprayed on the first surface 4c located on the right side of the blade portion 4b in the sectional view of FIG. 1 to form a very thin wear-resistant material thin layer 5. An example of a compound forming the thin layer 5 of the wear-resistant material is a vanadium alloy. The thickness of the thin layer 5 of the formed wear-resistant material is about 8 microns, and its micro-Vickers hardness is about 3200.

Thereafter, as shown in FIG. 1, a second surface 4d, which is located on the side opposite to the first surface 4c on the side where the thin layer 5 of the wear-resistant material is present, is cut obliquely in the blade portion 4b. The thin layer 5 of the wear material is configured to be located at the tip 4e of the blade portion 4b.
Thus, as shown in FIGS. 2 and 3, the blade 4 b of the stem-and-culm cutting blade 4 is formed in a radial wave shape, and the blade 4 b is formed in a saw blade shape.

In this way, as shown in FIG. 1, the cutting body 4 for cutting stems and stems is configured such that the blade 4b provided on the periphery of the disc-shaped main body 4a has a crossing angle with respect to the axis of rotation in cross section. The first surface 4c on the side close to the virtual rotation surface f, which is perpendicular, and obliquely intersects the rotation axis and the first surface 4c on the back surface side of the first surface 4c. The second surface 4d, which is an inclined surface, forms a tapered shape.
Further, the angle β formed by the virtual rotation surface f and the second surface 4d
From the first surface 4c and the second surface 4d with respect to the virtual rotation surface f so that the value obtained by subtracting the angle α formed between the virtual rotation surface f and the first surface 4c becomes the cutting edge angle θ of the blade portion 4b. Each angle is set. The second surface 4d, which is located on the back side of the first surface 4c on which the thin layer 5 of the wear-resistant compound is formed, is formed so that the thin layer 5 of the wear-resistant film does not exist. The blade 4b is configured.

[Alternative Embodiment] In the above-described embodiment, the outer peripheral blade portion 4b is formed into a corrugated shape by press working, but may be a simple flat plate without performing such press working. In FIG. 1, the surface 4c of the wear-resistant material on the thin layer 5 side is not particularly cut. However, the surface 4c of the wear-resistant material on the thin layer 5 side is also cut obliquely in FIG. 1, and then welded or sprayed. May form the thin layer 5 of the wear resistant material.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a side view of a longitudinal section near a cutting blade of a cutting body for cutting a stem.

FIG. 2 is an overall front view of a blade for cutting stems and stems.

FIG. 3 is a plan view of the cutting blade of the stem / culm cutting blade of FIG. 1 as viewed from above the paper surface;

FIG. 4 is a schematic plan view of a shredder for discharging straw.

FIG. 5 is a longitudinal sectional side view of the vicinity of a cutting blade in a conventional blade for cutting a stem and stem.

[Explanation of symbols]

 4a Body of blade for cutting stem and stem 4b Blade 4c First surface of blade 4d Second surface of blade 4e Tip of blade 5 Thin layer of wear-resistant material

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho-53-2095 (JP, U) Japanese Utility Model Hei 3-83028 (JP, U) Japanese Utility Model Sho 62-116662 (JP, U) Japanese Utility Model Sho-52 145166 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01F 29/00-29/22 A01F 12/40

Claims (4)

(57) [Claims] 1. A disk-shaped main body (4a) provided at a peripheral portion of the main body.
The blade part (4b) intersects with the axis of rotation in a sectional view.
The virtual rotation plane (f) whose angle is vertical is
A first surface (4c) closer to the turning surface (f), and the first surface
On the back surface side of (4c), the rotation axis and the first surface (4c)
The second surface (4d), which consists of an inclined surface that crosses obliquely,
And the angle formed by the virtual rotation surface (f) and the second surface (4d).
From (β), the virtual rotation surface (f) and the first surface (4c)
The value obtained by subtracting the angle (α) between the blades is the blade angle of the blade (4b).
(Θ), the first surface with respect to the virtual rotation surface (f)
Each angle between (4c) and the second surface (4d) is set, and the first surface (4c) is further provided with an abrasion-resistant compound (5).
To form a thin layer (5) with a film of
The second surface (4) where there is no thin layer (5) due to the abrasive coating
A cutting body for cutting stems and stems, wherein the cutting portion (4b) is configured by positioning d) . 2. A blade whose outer periphery of a disk-shaped main body (4a) has a saw-tooth shape.
The blade for cutting stems and stems according to claim 1 , wherein the blade is formed in the portion (4b) . 3. An outer peripheral surface of the disk-shaped main body (4a) is pressed in a radial waveform, and the corrugated pressed portion is cut obliquely from one side to form an entire circumference of the disk-shaped main body (4a). The blade portion (4b) is formed in a saw-tooth shape
The cutting body for cutting a stem / culm according to claim 1 or 2 . 4. A disk having a blade portion (4b) formed on the outer periphery.
A rotating shaft (1) having a main body (4a) laid substantially parallel thereto,
(2) are mounted at predetermined intervals, and both blades (4b) are configured to overlap each other when viewed in the axial direction.
The blade for cutting a stem / culm according to claim 1, 2, or 3 is used.
Waste straw shredder.